2005 Mercedes-Benz P0442: What It Means & Is It Safe to Drive?
P0442 on the 2005 Mercedes-Benz: Evaporative Emission System Leak Detected (Small Leak). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
The EVAP system has detected a small leak. Often caused by a loose or faulty gas cap or a small hose leak.
Common causes on the 2005 Mercedes-Benz
- Loose, damaged, or wrong gas cap
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Leaking charcoal canister
Symptoms
- Check Engine Light
- Often no driveability issues
Typical fixes
- Tighten or replace gas cap
- Smoke test EVAP system
- Replace damaged hoses or valves
Repair cost range
For a 2005 Mercedes-Benz, repairs for P0442 typically fall between $15 and $300, depending on the root cause and labor rates in your area.
Known issues on Mercedes-Benz
Mercedes P0442 on M272 engines often points to a faulty EVAP purge valve or a cracked EVAP hose. Mercedes EVAP systems are reliable but the purge valve can fail on high-mileage units—smoke test to confirm location.
Most commonly affected models
C300 2008–2014E350 2010–2015ML350 2012–2015